Recently had hard drive failure which required installation of new drive. Loaded Windows XP professional, all revelent drivers, Windows updates and applications. No issues for about a week until today. Upon booting up and coming to home screen I suddenly got a small window up asking me to "Choose a program you want to use to open this file." But instead of seeing a file, I see the following: {70AB5C6A-D3B3-4E9A-A3C3-F223FB87F510}. Since I don't know what file this is, it is hard to determine how to fix it. Looks like a registry entry. I get this each time I boot up my computer and come to home screen. Any ideas?